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Response of Multi-Incidence Angle Polarimetric RADARSAT-2 Data to Herbaceous Vegetation Features in the Lower Paraná River Floodplain, Argentina
| Content Provider | MDPI |
|---|---|
| Author | Morandeira, Natalia Barber, Matías Grings, Francisco Ahern, Frank Kandus, Patricia Brisco, Brian |
| Copyright Year | 2021 |
| Description | Wetland ecosystems play a key role in hydrological and biogeochemical cycles. In emergent vegetation targets, the occurrence of double-bounce scatter is indicative of the presence of water and can be valuable for hydrological monitoring. Double-bounce scatter would lead to an increase of σ^{0}$_{HH}$ over σ^{0}$_{VV}$ and a non-zero co-polarized phase difference (CPD). In the Lower Paraná River floodplain, a total of 11 full polarimetric RADARSAT-2 scenes from a wide range of incidence angles were acquired during a month. Flooded targets dominated by two herbaceous species were sampled: Schoenoplectus californicus (four sites, Bulrush marshes) and Ludwigia peruviana (three sites, Broadleaf marshes). As a general trend, σ^{0}$_{HH}$ was higher than σ^{0}$_{VV}$, especially at the steeper incidence angles. By modeling CPD with maximum likelihood estimations, we found results consistent with double-bounce scatter in two Ludwigia plots, at certain scene incidence angles. Incidence angle accounted for most of the variation on σ^{0}$_{HH}$, whereas emergent green biomass was the main feature influencing σ^{0}$_{HV}$. Multivariate models explaining backscattering variation included the incidence angle and at least two of these variables: emergent plant height, stem diameter, number of green stems, and emergent green biomass. This study provides an example of using CPD to decide on the contribution of double-bounce scatter and highlights the influence of vegetation biomass on radar response. Even with the presence of water below vegetation, the contribution of double-bounce scatter to C-band backscattering depends on scene incidence angles and may be negligible in dense herbaceous targets. |
| Starting Page | 2518 |
| e-ISSN | 20724292 |
| DOI | 10.3390/rs13132518 |
| Journal | Remote Sensing |
| Issue Number | 13 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-06-27 |
| Access Restriction | Open |
| Subject Keyword | Remote Sensing Imaging Science Active Microwave C-band Co-polarized Phase Difference Double-bounce Scatter Flooded Marshes Incidence Angle Macrophytes Paraná River Delta Polarimetry Wetland |
| Content Type | Text |
| Resource Type | Article |
